The project began because of an unusually early start to the 2003-2004 influenza
season coupled with reports of influenza-associated complications and deaths in children. 

As a result, the EIP states began conducting population-based surveillance to assess the burden of influenza in pediatric patients. Adult influenza hospitalization surveillance began during the 2005-06 influenza season and expanded upon the existing pediatric surveillance structure. The primary objective for these surveillance projects is to determine the rate of influenza among these populations as well as describe the characteristics of children and adults with severe flu. These projects also contribute to evaluations of current influenza vaccine recommendations.

On this page:

Surveillance Activities • Data • Special Studies

Ongoing Influenza Hospital
Surveillance Activities

Enhanced surveillance is conducted for:

• All ages hospitalized with lab-confirmed influenza (including rapid tests) for residents living in Washington, Clackamas, and Multnomah counties;

Influenza Hospital Surveillance Data

Influenza Hospital Surveillance Data As Part of Oregon EIP

• H1N1 hospitalizations and deaths 2009-2010 Season


• Pediatric surveillance data years 2003 to 2008


• Adult surveillance data years 2005 to 2008

Influenza Hospital Surveillance
Special Studies

To see all Oregon Emerging Infections Program special studies go to EIP special studies.